I am no longer maintaining the electronics sections of this site. For an explanation, see the electronics contact page. If you need help, you can ask your question in The Forum.

Voltage Inverter II

This simple and inexpensive circuit can produce a dual (positive and negative) voltage from a single supply input. It is therefore extremely useful for powering opamp and other circuits that require a dual voltage from a single battery. The circuit will operate at an input voltage from around 5V to 20V and produce a output from +-2.5V to +-10V.

Schematic

This is the schematic of the Voltage Inverter

Parts


Part
Total Qty.
Description
Substitutions
R111M Linear Pot
C1,C2215uf 25V Electrolytic Capacitor
U11LM380 Audio Amp Chip
MISC1Heatsink For U1, Binding Posts (For Input/Output), Wire, Board

Notes

1. U1 dissipates around 1W and will therefore require a heatsink.

2. R1 is used to equalize the outputs. The first time you use the circuit, it should be set to mid range and then adjusted with the aid of a voltmeter. Measure each output while adjusting. The circuit is calibrated when both outputs read the same voltage (either positive or negative).

Back To Circuits Page | Mail Me | Search